pip install APScheduler==3.8.1

In-process task scheduler with Cron-like capabilities

Source
Among top 1000 packages on PyPI.
Over 10.3M downloads in the last 90 days.

Commonly used with APScheduler

Based on how often these packages appear together in public requirements.txt files on GitHub.

tzlocal

tzinfo object for the local timezone

pyowm

A Python wrapper around OpenWeatherMap web APIs

astral

Calculations for the position of the sun and moon.

parsedatetime

Parse human-readable date/time text.

inflect

Correctly generate plurals, singular nouns, ordinals, indefinite articles; convert numbers to words

structlog

Structured Logging for Python

twilio

Twilio API client and TwiML generator

rethinkdb

Python driver library for the RethinkDB database server.

paho-mqtt

MQTT version 5.0/3.1.1 client class

kafka-python

Pure Python client for Apache Kafka

uuid

UUID object and generation functions (Python 2.3 or higher)

ago

ago: Human readable timedeltas

sleekxmpp

SleekXMPP is an elegant Python library for XMPP (aka Jabber, Google Talk, etc).

splitwise

Splitwise Python SDK

googlemaps

Python client library for Google Maps Platform

pytz

World timezone definitions, modern and historical

transmissionrpc

Python module that implements the Transmission bittorent client RPC protocol.

DateTime

This package provides a DateTime data type, as known from Zope. Unless you need to communicate with Zope APIs, you're probably better off using Python's built-in datetime module.

pushbullet.py

A simple python client for pushbullet.com

Version usage of APScheduler

Proportion of downloaded versions in the last 3 months (only versions over 1%).

3.7.0

50.67%

3.6.3

27.57%

3.8.0

10.55%

3.8.1

4.34%

3.6.0

2.55%

3.5.3

1.44%